Defined in: | packages/ember-glimmer/lib/helper.js:12 |
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Module: | ember |
Defined in packages/ember-glimmer/lib/helper.js:88
Override this function when writing a class-based helper.
Defined in packages/ember-glimmer/lib/helper.js:103
In many cases, the ceremony of a full Ember.Helper
class is not required. The helper
method create pure-function helpers without instances. For example:
// app/helpers/format-currency.js export default Ember.Helper.helper(function(params, hash) { let cents = params[0]; let currency = hash.currency; return `${currency}${cents * 0.01}`; });
Defined in packages/ember-glimmer/lib/helper.js:60
On a class-based helper, it may be useful to force a recomputation of that helpers value. This is akin to rerender
on a component.
For example, this component will rerender when the currentUser
on a session service changes:
// app/helpers/current-user-email.js export default Ember.Helper.extend({ session: Ember.inject.service(), onNewUser: Ember.observer('session.currentUser', function() { this.recompute(); }), compute() { return this.get('session.currentUser.email'); } });
© 2017 Yehuda Katz, Tom Dale and Ember.js contributors
Licensed under the MIT License.
https://emberjs.com/api/ember/2.15/classes/Ember.Helper/methods